The Chipmunks have been very bad at my new house. I have temporarily placed rocks around holes that I have seen. (Researching methods of tackling the Chipmunks in general) There were 2 holes at the base of my above ground pool and overnight they have dug beside one and now there is a very deep hole which has caused the bottom of the pool to sag. I know this can't be good. How do I go about fixing this?